Save it for a lifetime

❯ SQL ➟ sqlbolt
❯ C ➟ learn-c
❯ C++ ➟ codecademy
❯ JavaScript ➟ javascript .info
❯ Python ➟ kaggle/python
❯ PHP ➟ learn-php
❯ Java ➟ codecademy
❯ C# ➟ learncs
❯ Kotlin ➟ codecademy
❯ Go ➟ learn-golang
❯ Swift ➟ codecademy

A few more,

❯ HTML and CSS ➟ learn-html
❯ React ➟ scrimba
❯ Laravel ➟ laracasts
❯ Full Stack ➟ theodinproject
❯ DSA ➟ programiz & G4G

Other popular sites,

❯ w3schools
❯ tutorialspoint
❯ programiz
❯ geeksforgeeks